1 files changed, 16 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/api/response/multi-globals/incumbent/incumbent.html b/testing/web-platform/tests/fetch/api/response/multi-globals/incumbent/incumbent.html
new file mode 100644
index 0000000000..f63372e64c
--- /dev/null
+++ b/testing/web-platform/tests/fetch/api/response/multi-globals/incumbent/incumbent.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>Incumbent page used as a test helper</title>
+
+<iframe src="../current/current.html" id="c"></iframe>
+<iframe src="../relevant/relevant.html" id="r"></iframe>
+
+<script>
+'use strict';
+
+window.createRedirectResponse = (...args) => {
+    const current = document.querySelector('#c').contentWindow;
+    const relevant = document.querySelector('#r').contentWindow;
+    return current.Response.redirect.call(relevant.Response, ...args);
+};
+
+</script>